Strength reduction of cohesionless soil due to internal erosion induced by one-dimensional upward seepage flow
Strength reduction of cohesionless soil due to internal erosion induced by one-dimensional upward seepage flow
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DOI：
10.1016/j.sandf.2012.07.010
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发表时间：
2012-08-01
影响因子：
3.7
通讯作者：
Takahashi, Akihiro
中科院分区：
文献类型：
--
作者：
Ke, Lin;Takahashi, Akihiro
在自然沉积物和充填构造中都广泛发现了内部侵蚀的一种方式——浸没作用。它是土壤中的细颗粒逐渐通过粗颗粒之间的空隙迁移，留下土壤骨架的现象。本文主要研究了内部侵蚀对土壤强度的影响。通过控制(A)土的细粒含量、(b)土的相对密度、(c)施加在试样上的最大水力梯度三个可变参数，进行了一系列恒定水头下的一维向上渗流试验，以引起土样的内侵蚀。内部侵蚀的力学后果通过锥贯入试验来检验。以细颗粒损失为表征的内部侵蚀导致孔隙比发生变化，导水率显著升高，导致土体强度较初始值有所下降。(c) 2012日本岩土学会。Elsevier B.V.版权所有。
Suffusion, one of the modes of internal erosion, has been widely detected in both natural deposits and filled structures. It is the phenomenon that the fine particles in soil gradually migrate through the voids between the coarse particles, leaving behind the soil skeleton. In this paper, the main focus is on the changes in soil strength due to internal erosion. A series of one-dimensional upward seepage tests at a constant water head is performed to cause internal erosion in a soil sample by controlling the three variable parameters, namely (a) the fine content, (b) the relative density of the soil, and (c) the maximum imposed hydraulic gradient on the specimen. The mechanical consequences of the internal erosion are examined by cone penetration tests. The internal erosion indicated by the loss of fine particles causes changes in the void ratio and a significant increase in hydraulic conductivity, resulting in a decrease in the soil strength from its initial value. (c) 2012 The Japanese Geotechnical Society. Production and hosting by Elsevier B.V. All rights reserved.